Saw-setting machine



(ModeL) 2 Sheets- Sheet 2.

J. 1-". BREDIN. SAW SETTING MACHINE.

No. 557,959.- Patented. Apr. 7, 1896.

ANDRKW BJiRAKAMJflD'm-LITNO. WASHINGTON DYC NITED STATES PATENT FFICE.

JOIIN FREDRICK BREDIN, OF MUSKEGON, MICHIGAN.

SAW-SETTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 557,959, dated April '7, 1896.

Application filed February 15, 1895. Serial No- 53 8,504. (ModeL) To all whom it may concern.-

Be it known that I, JOHN FREDRICK BRE- DIN, a citizen of the United States, residing at Muskegon, in the county of M uskegon and State of Michigan, have invented certain new and useful Improvements in Saw-Setting Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improvement in saw-setting machinery, the same being particularly applicable to band-saws, although of course it may be used with any style of saws, the object of the invention being to insure rapidity and accuracy of operation in setting the teeth; and the inventionconsists, essentially, in the details of construction and arrangement of a machine, embracinga main frame, which is partlystationary and partly movable, a movable lever fulcrumed on the top of each part of the frame, steel plates or punches pivoted to the said levers and operating against the teeth of the saw to set the teeth over, suitable cams for alternately operating the two levers, these cams being placed on the main operating-shaft directly adjacent to each other, so that by turning the crank-handle attached to the shaft both levers will be operated upon at each revolution of the shaft, the result of which will be that two saw-teeth will be operated upon, one being set to one sideand the other to the other side; and the invention also consists in numerous details in the construction, arrangement, and combination of parts, sub stantially as will be hereinafter described, and then more particularly pointed out in the appended claims.

In the annexed drawings, illustrating my invention, Figure 1 is a side elevation of my improved saw-setting machine. Fig. 2 is a top plan view of the same; Fig. 3 is a detail side elevation of one of the punch-operating levers. Fig. 4 is a top plan view of the same. Figs; 5 and 6 represent detail plan and elevational views of the guide-pieces employed above the saw-teeth for keeping the saw in position while it is traveling through the machine. Fig. 7 isaninner face viewof one of the nuts used on one end of the main shaft and shows the projections on said nut. Fig. 8 is a front elevation of the stationary portion of the main frame and the mechanism arranged in connection therewith, the main shaft being shown in cross-section. Fig. 9 is a partial elevational View of the movable portion of the main frame. Fig. 10 is a detail View of a slotted plate which is employed for adjusting the height of the saw in the machine. Figs. 11 and 12 represent front and edge views of the double cam on the main shaft, which operates the mechanism for causing the saw to travel through the machine. Figs. 13 and 14 represent enlarged end and side views of one of the cams for actuating the punch-operatin g levers. larged side view of one of the nuts that adjust the cams in the drive-shaft.

Like letters of reference designate like parts in all the different figures of the drawings.

A denotes the stationary or immovable part of the main frame of the machine, and B the movable part. These two parts or frames are hinged together at the bottom by means of some suitable hinging device, as the bolt (1., that passes through the lugs a on the stationary frame A, and the lugs 17 on the movable frame B.

The frames A and B may have any desired form that will accommodate the mechanical parts, and I generally prefer to make them of an upright pattern, in order that the horizontal drive-shaft may be easily supported therein. These frames A and B are slotted at their upper ends or provided with double jaws 19, between which jaws are pivoted the depending levers O and D, the construction of which is clearly seen in the detailed views of Figs. 3 and 4. The lower ends of these levers are provided with an angular projection c, which istwisted or shaped to conform to double jaws d, between which are pivoted the steel plates or punches E, which slide in the grooves e of the frames A and B. The lower edges of these punches E rest on the frame, while the front edges are beveled forwardly,

Fig. 15 is an enthe ends of the spring f are placed.

as shown, to conform to the set of a tooth. Each plate is pierced with a hole, into which This spring is not fastened permanently to the punches or plates, but is easily removable therefrom, so that it may be removed when 'a saw is to be put into the machine and then replaced again after the saw is in position. The object of the spring is to push the punchcarrying levers back into their original position after the cams cease to act to push them forward.

Gr denotes the horizontal drive-shaft. It extends through both frames A and B and is supported rotatably in bearings therein. It

. is furnished at one end with a crank-handle g, which is screwed upon the end of shaft G and acts as a jam-nut for the nut g. At its opposite end the shaft G is provided with two nuts, one of which acts as a jam-nut, while the other, H, which is next to the frame B, is preferably made of hardened steel and is provided with two projections 7L on the face of the nut next to frame 13. A view of this nut H is shown clearly in Fig. 7. The projections 7t 77. work against a steel piece h, let into the back of the movable frame B and fastened by means of the screws 7L2. (See Figs. 1 and 9.)

I I designate two cams located on the shaft Gin the proper position for acting against and operating the punch-carrying levers O and D. These cams I are made right and left and slide on feathers sunk in the shaft G and placed opposite to one another on the same. An enlarged side and end view of one of these cams is shown in Figs. 13 and 14. Each cam has a lip i, which is adapted to engage the peripheral groove j of the nuts K, which nuts K are likewise on shaft G, and engages the screw-threaded portion thereof, so that they may be adjusted along the shaft for a greater or less distance, and by such adjustment the cams maybe placed in proper position to act in the desired manner upon the levers O and D, whereby said levers may be forced forward, so that the punching-plates E will give the desired set to the saw-teeth. The shaft G is screwed far enough at both ends within the face of the nuts K to allow the cams I to throw the levers C and D as far as may ever be necessary.

The stationary frame A is provided with two vertical arms 76 7a, having slots 76 extending nearly their entire length. (See Fig. 8.) The faces of the arms 7t, and also of an intermediate recess Win the vertical face of the horizontal platen Z, that forms a part of the frame A, are set back a little from the vertical face of platen Z, said face being that against which the saw rests when in the machine. (See Figs. 1 and 8.) The movable frame B has a horizontal platen or bar L corresponding in form to the bar Z, and it is likewise provided with depressions corresponding to those in the bar Z. The saw, it will be understood, is to be placed between bars L Z.

M indicates a steel plate which is situated vertically between the bars L Z and within the aforesaid depressions. (See Fig. 10.) It is secured to the arms by bolts m m, that pass through the slots 70. It will therefore be seen that the plate M can be raised or lowered vertically and secured in any desired position of adjustment by means of the bolts m. It can thus be arranged to suit saws of different sizes. The saw when in the machine rests with its rear edge upon the upper edge of plate M and between thebars L Z. The plate M will be of a proper thickness, so that when it is fastened in place the surfaces of the bars L Z of the two frames will be closely contiguous to each other.

On the shaft G, in addition to the cams I I, is a double-pointed cam N, which is directly opposite to the swinging arm 0, that operates as the cam acts thereon to cause the mechanical parts connected therewithto feed the saw through the machine at the rate of the distance of one tooth at each movement. A side an (1 end view of this cam N may be seen in Figs. 11 and 12. On the bar or platen Z,which as seen forms a part of the stationary frame A, are a couple of lugs 13 1), (see Fig. 2,) and in these lugs works a screw 0. (See Figs. 2 and 8.) The screw is kept in place by being turned smaller at one end, whereby a shoulder is provided, and by having a cross-pin p fastened through it near the other end on the inside of the lug 19 at that point. This allows the screw always to keep in the same endwise position while it is free to revolve. On the screw 0 is a circular nut R, (see Fig. 2,) that extends through the hub of the arm 0 and is provided at one end with an extended bolt and nut 0, so that when the nut R is adjusted laterally it can be fastened to the bar Z in the slot r thereof. The hub of the arm 0, through which the screw 0 passes, is slotted at both sides, as shown at s in Fig. 8, to allow the arm 0 to oscillate on the nut R while the nut remains stationary. The arm 0 has an angular projection that is pro vided at its outer end with a weight T, which serves to restore the arm 0 to its original position after the cam N ceases to act upon the end of said arm.

To the upper end of arm 0 is pivoted the pawl or finger U, the point of which extends across the faces of the saw and engages with the teeth thereof. As the arm 0 oscillates under the rotative action of the cam N, the finger U is oscillated likewise, and it operates to feed the saw along by engaging successively with its teeth, so that said teeth are successively brought under the action of the punches E E.

Vdenotes a set-screw that is tapped into the lug u on the stationary frame A, and is used for giving the proper range to the finger U to suit the lengths of different teeth.

WV (see Figs. 5 and 6) denotes a guide placed just above the teeth of the saw, so as .to keep it from rising too high when itis being moved forward by the finger U. There are two of these guides, they being made right and left.

. nut 0.

. nut, as shown at Fig. 1.

In Fig. 8 one is shown fastened bya screwto the frame. The place in plan, Fig. 2, where this one is fixed is shown by the reference-letter X, while the other one is fixed to the movable frame to the jaw Y on plan. These guides can be raised or lowered to suit the different depths of saws, and their ends are shown rounded, as in Fig. 6, so that the guide can be thrown out of the way when taking out or putting a saw into the machine.

Y denotes set-screws used as stops for the levers G and D.

In operating this machine when a saw is to be put in, the fingerUis turn-ed back and the spring f is taken out. The saw is then i11- serted between the right-angled arms or bars L and Z. The plate M, 011 which the back edge of the saw rests, is then lifted to the proper height to suit the teeth and securely fastened to the arms k by the bolts m. The front of the tooth is then placed opposite the punch E. The handle g is then turned sufficiently, so that the steel nut II engages with the steel projection h on the back of the movable frame B. This forces the arms L and Ztogether and firmly clasps the saw. The finger U is then brought into its place, as shown at Fig. 8. The arm 0 is then moved horizontally either way simply by turning the screw 0. Vhen the point of the finger U comes in contact with the face of a tooth, the arm 0 is then secured to the frame by means of the The screw V is turned far enough back so that the finger U will engage another tooth. This screw is the device for gaging the travel of the finger. It is then necessary to set the punch E far enough ahead so as to get the desired set on the tooth. This is accomplished by turning the nuts K on the shaft, the lip of the cam I engaging with the hen each nut is revolved, the cam is moved laterally along the shaft into such a position that when the cam has passed its contact with the arm the punch has then set the tooth. Both of the arms 0 and D are treated in the same manner. Consequently the teeth will be set properly on both sides of the saw.

In setting the machine so as to firmly clasp the different thicknesses of saws, the handle g, which acts as a jam-nut, is released and the steel projection h on nut H and h on frame are brought in contact together. The saw is then put in the machine and the nut g is then screwed tight against the stationary frame until the saw is firmly clasped. The handle is then screwed against the nut g and the operation is complete. It will be evident from Fig. 1 that the fulcrum of the punch in its forward motion rises. Consequently the angle at the point of the punch becomes more acute, the result of which is that the tooth is bent in a curved surface. This form of tooth I claim is a great improvement on the straight form of tooth as set by other machines.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a saw-tooth-setting machine, the combination of the two-part main frame, means for moving the parts thereof toward each other, the depending punch-carrying arms pivoted to said frames, the lower ends of the arms having a cam form, and the cam mechanism which operates in conjunction with said cam ends of the arms, substantially as described.

2. In a saw-setting machine, the combination of the main frame, consisting of two interhinged parts, the swinging arms pivoted within the bifurcated ends of said parts, the punch devices pivoted to the said arms and adapted to slide horizontally in the frame, the cam-shaft that operates to oscillate the arms, and to move the parts of the main frame toward each other, and feed devices for the saw, substantially as described.

3. The combination with the main frame, of the punch-carrying armspivoted within the bifurcated upper ends of said frame, the punches pivoted to said arms, means for retracting the arms and punches, and means for alternately moving the arms and punches forward, substantially as and for the purpose specified.

4. In a saw-setting machine, the combination of the main frame consisting essentially of two interhinged parts, each having a horizontal platen or bar, the intermediately-disposed saw-support located between these bars and vertically adjustable, the punching mechanism for the saw-teeth, and the feed mechanism, substantially as described.

5. The combination of the main frame, the swinging punch-carrying arms, pivoted within the bifurcated upper ends of said frame, the drive-shaft supported in the main frame, and the cams on said shaft, each cam having a lip, together with the grooved adjustable nuts also on said shaft and engaged by the cam-lips, substantially as described.

6. The combination of the two-part main frame, the parts whereof are hinged together, the saw-settin g punches carried thereby, the main shaft carrying cams for operating the punches, and a cam upon said main shaft for forcing the-parts of the main frame toward each other for alternately clamping and releasing the saw, substantially as and for the purpose specified.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN FREDRIOK BREDIN.

WVitnesses:

NELLY ROAOH, PETER W. LOSBY.- 

